There seems to be some confusion about Aragon and quality because Dan D'agostino had something to do with the design. However, Aragon has more in common with Adcom than Krell.
There are too many good sounding amplifiers from the '70s and '80s like Krell, Mark Levinson, Threshold, Audio Research, Quicksilver, Robertson and Dynaco are just a few that come to mind.